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Six Years of Experience in Entomological Akogbéto et al. Malaria Journal (2015) 14:242 DOI 10.1186/s12936-015-0757-5 RESEARCH Open Access Six years of experience in entomological surveillance of indoor residual spraying against malaria transmission in Benin: lessons learned, challenges and outlooks Martin C. Akogbéto1,2, Rock Y. Aïkpon1,2*, Roseric Azondékon1,3, Gil G. Padonou1,2, Razaki A. Ossè1,4, Fiacre R. Agossa1,2, Raymond Beach5 and Michel Sèzonlin2 Abstract Background: From 2008 to 2013, a prevention intervention against malaria based on indoor residual spraying (IRS) was implemented in Benin. From 2008 to 2012, Ficam M®, a bendiocarb-containing product was used for house spraying, in association with pirimiphos methyl EC (Actellic EC) in 2013. This operation aimed to strengthen the effectiveness of treated nets so as to expedite the achievement of Millennium Development Goals (MDGs): the reduction of morbidity and mortality due to malaria by 75 % from 2000 to 2015. Methods: Monitoring and evaluation (M&E) was implemented in order to evaluate the impact of IRS intervention on malaria transmission. Anopheles gambiae s.l. populations were sampled by human landing catch. In addition, window exit traps and pyrethrum spray catches were performed to assess exophagic behaviour of Anopheles vectors the main malaria vector in the treated areas. The residual activity of insecticide in the treated walls was also assessed using WHO bioassay test. Results: The purpose of this project was to draw attention to new challenges and future prospects for the success of IRS in Benin. The main strength of the intervention was a large-scale operation in which more than 80 % of the houses were treated due to the strong adhesion of population. In addition, a significant reduction of the EIR in areas under IRS were observed. However, there were many challenges including the high cost of IRS implementation and the identification of suitable areas to implement IRS. This was because of the low and short residual effect of the insecticides recommended for IRS and the management strategy for vector resistance to insecticides. This indicated that challenges are accompanied by suggested solutions. For the cost of IRS to be accessible to states, then local organizations need to be created in partnership with the National Malaria Control Programme (NMCP) in order to ensure relevant planning and implementation of IRS. Conclusion: As an anticipatory measure against vector resistance, this paper proposes various methods, such as periodic IRS based on a combination of two or three insecticides of different classes used in rotation every two or three years. Keywords: Indoor residual spraying, Lessons learned, Benin * Correspondence: [email protected] 1Centre de Recherche Entomologique de Cotonou (CREC), 06 BP 2604 Cotonou, Bénin 2Faculté des Sciences et Techniques, Université d’Abomey Calavi, Cotonou, Bénin Full list of author information is available at the end of the article © 2015 Akogbéto et al. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http:// creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Akogbéto et al. Malaria Journal (2015) 14:242 Page 2 of 12 Background malaria transmission mainly through LLIN, IRS and ac- In 2008, Benin committed, for the first time, to imple- cess to treatment it is recognized that, evaluation and menting an IRS campaign in order to protect its popula- routine vector surveillance is a weak component of tion against malaria. Such a strategy was chosen to many national disease control programmes. Vector sur- strengthen the action of the existing long-lasting insecti- veillance should be increased prominence in the plan- cidal Nets (LLINs) as first prevention strategy against mal- ning, implementation, monitoring, and evaluation of aria. Indeed, Benin had signed up to the Millennium vector control interventions. The goal of this study was Development Goals (MDGs), which components included to evaluate entomological impact following large-scale a 75 % reduction of malaria morbidity and mortality be- protection through the spraying in two departments tween 2000 and 2015. To achieve this level of malaria re- of Benin. This evaluation focused on the decay of in- duction within 15 years, an integrated control based on secticide on treated walls, the population dynamics of the simultaneous use of multiple strategies against the Anopheles gambiae, the level of entomological inocula- vector and the parasite was necessary. In Africa, particu- tion rate (EIR), and the development of vector resistance larly in Benin, the first mass preventative method effect- in areas under intervention compared to control areas. ively applicable against mosquito bites is the use of LLINs This document is not a collection of impact indicators, [1, 2]. A great deal of progress has been made in Benin as it also leveraged six years of IRS tracking experience in far as the use of this preventative method is concerned. the field to identify the new challenges. Suggestions are The rate of LLIN use by pregnant women and children maked to address them and views on the future of IRS under five increased from 32 % in 2006 to 60 % in 2010 in Benin are given. and 70 % in 2013 through a mass distribution [3, 4]. Simi- lar progress has been noted regarding the implementation Methods of indoor residual spraying (IRS). The proportion of the Intervention areas African population at risk of malaria but protected by IRS Two IRS campaigns were implemented by the NMCP increased from 5 % in 2005 to 11 % in 2011 [5]. As docu- from 2008 to 2013. In 2008, IRS was conducted in mented in recent World Malaria Reports, reductions in Ouémé Department in southeast Benin (Fig. 1), protec- malaria disease burden have coincided with the massive ting 350,000 people. Four out of the nine districts in that scale-up of malaria prevention measures, particularly the department were involved in this operation: Adjohoun, use of LLINs and IRS [5, 6]. The National Malaria Control Dangbo, Sèmè, and Missérété. Programme (NMCP) of Benin has noted that IRS is a South of Benin is characterized by two dry seasons promising intervention in reducing the malaria burden. (December to March and August to September) and two Some African countries, particularly Zimbabwe, Namibia, rainy seasons (April to July and October to November). Swaziland, Botswana, and Mozambique have had a reduc- The existence of two rainy seasons in the year results in tion in malaria transmission and parasite rates of Plasmo- an almost year-round presence of Anopheles and per- dium in children [7] with prolonged IRS campaigns over manent malaria transmission. Given the short, residual several decades. Maxwell et al. [8] also observed a de- action of insecticides currently available for IRS, the crease in anaemia and child mortality rates resulting from spraying has to be conducted at least twice a year in order the massive use of impregnated nets (ITNs). According to to expect a significant decrease in Anopheles density Lengeler [1], 5.5/1,000 children are saved due to sleeping throughout the year. Unfortunately, the cost of IRS oper- under ITNs. ation makes it impossible for Benin to afford spraying Malaria elimination is conceivable; it will require a lot twice a year. of political will, effort and expertise. Based on the year-round transmission and presence of The IRS campaign started in Benin in 2008 with the malaria and its vector due to the two rainy seasons per year, support of The President’s Malaria Initiative (PMI). IRS was discontinued in Ouémé and moved to Atacora From 2008 to 2010, over 315,000 people out of 350,000 Department, north of Benin in 2011. This department is were protected per year by the intervention in Ouémé characterized by one dry season (November to May) and Department, south of Benin. From 2011 to 2013, the oper- one rainy season (June to October). Some 650,000 in- ation was moved from Ouémé to Atacora (northern habitants were taken into account in the nine districts Benin) where over 650,000 people per year were protected. (Natitingou, Tanguieta, Toucountouna, Materi, Boucombe, Due to vector resistance to pyrethroids across Benin, two Cobly, Kouandé, Péhunco, and Kerou) that were covered insecticides of two different classes were used in rotation: by the operation. In Atacora, the major economic activity bendiocarb (a carbamate) and pirimiphos methyl EC is agriculture, mainly cotton and millet, for which various (an organophosphate). classes of pesticides (pyrethroid, carbamate, organophos- NMCPs in Africa usually implement good control phate) are used. In contrast, the main activities in Ouémé strategies; however, despite impressive reductions in include trade, corn agriculture and fishing facilitated by Akogbéto et al. Malaria Journal (2015) 14:242 Page 3 of 12 Fig. 1 Map of Benin showing the districts under IRS and those under Monitoring-Evaluation (study districts) the presence of Ouémé River. The M form of An. gam- (Fénitrothion, an organophosphate), Master Quick ZC biae, recently named Anopheles coluzzii [9], is the major (mixture of chlorpyriphos 250 g/l + deltamethrin 12 g/l), malaria vector in Ouémé and the S form named An. gam- and Ficam M® (bendiocarb 800 g/kg, a carbamate), proved biae [9] in Atacora. to be the most effective against pyrethroid-resistant An. gambiae [15]. However, after this evaluation, bendio- Control areas carb was the only product selected by the NMCP since In the Department of Ouémé, Adjara, a peripheral area Master Quick ZC formulation did not have World Health of Porto-Novo (administrative capital of Benin), was se- Organization Pesticide Evaluation Scheme (WHOPES) lected as a control (Fig.
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